I got rid of the last paper chart a few weeks ago. It had been sitting growing mold for 3 years. Like every other paper chart it had never been used during my whole circumnavigation.
It ships and aircraft don't have them why does your instructor think you do?
This is sure to start an interesting debate. In all my year of sailing (lol) I have been told by everyone to ALWAYS have paper charts on board as backup. You're the first one to advise ditching the paper.
I love using the electronics, even on my relatively simple boat. I daysail in a river, which requires a lot
of tacking, and I determine tacking points based on upcoming depth shown on the chartplotter. If I use the depthfinder, it will be too late and I'll run aground. (I've confirmed that the charted depths in my area are very accurate.)
However, I am taking an old fashioned Nav course (ASA 105) to be sure I have adequate skills with my backup method.
As for why airplanes don't need paper charts, if they have a total electrical failure, charts may be the least of their worries. If a sailboat has a total electrical failure, that's when the fun begins.
But you're more far more experienced than I am, so I guess you know better.